Ramjet 8GB (2x4GB) DDR3 1333 Upgrade Memory Module for iMac 11.3 (i3 only) 11.3 (i5 & i7) 12.1 12.2 8GB DDR3-1333 MHz SO-DIMM (2x4GB) for iMac 11,3 (i3,i5 ,i7) 12,1 and 12,2 Optimized and rigorously tested for Macs All Mac Memory Net products are sold exclusively by the Mac Memory Net Store